rails                  
                                          
                                          
  
                                          
  
                                          
                                          
 trains  are  so  constructed  that  they 
 have to follow a set path. this path  is 
 called  a  "railway", which is comprised 
 of two metal rails, hence  its nickname. 
                                          
 because  the low  friction  between  the 
 wheels of the  train and the rail metal, 
 there are limits  for how  acute a curve 
 can be,  and even  more  so for how much 
 the  ground  under  the  rails   can  be 
 sloped. thus a railway is  often not led 
 on top of  hills, rather through them in 
 tunnels  (if   they   are   large),   or 
            artificial chasms.            
                                          
 there will be trees on  the  side of the 
 rails, but  not  too close, or they will 
 be  cut down by  the  railway  janitors. 
 there  will  be  plains,  and  bodies of 
                  water.                  
                                          
 trains  go by  day  and by  night. along 
       the way, there is information      
 scattered,  often  put on top of  poles, 
 to be interpreted by the  train drivers. 
 different  parts  of  the  railway  have 
         different speed limits.          
                                          
 sometimes,  trains have to stop and wait 
 for something to happen,  far away. this 
 is signaled  by  red  or  green  lights. 
                                          
                                  
                                          
 many  people  follow the rails by  foot. 
 often  this  proves  to  be the  shorter 
 path between  two points.  however  this 
 is  frowned  upon,  and  very   impolite 
         toward the train drivers!